
1.0 Signal/Pin Connection and Description
(Continued)
Revision 1.2
27
www.national.com
P
1.4.7
Keyboard and Mouse Controller (KBC)
1.4.8
General-Purpose I/O (GPIO)
Signal
Pin/s
I/O Buffer Type Power Well
Description
KBCLK
125
I/O
IN
TS
/OD
14
V
DD
Keyboard Clock.
Keyboard clock signal. External pull-up resistor
is required for PS/2 compliance. This pin is monitored during V
DD
power-off for wake-up event detection.
KBDAT
126
I/O
IN
TS
/OD
14
V
DD
Keyboard Data.
Keyboard data signal. External pull-up resistor is
required for PS/2 compliance. This pin is monitored during V
DD
power-off for wake-up event detection.
MCLK
127
I/O
IN
TS
/OD
14
V
DD
Mouse Clock.
Mouse clock signal. External pull-up resistor is
required for PS/2 compliance. This pin is monitored during V
DD
power-off for wake-up event detection.
MDAT
128
I/O
IN
TS
/OD
14
V
DD
Mouse Data.
Mouse data signal. External pull-up resistor is
required for PS/2 compliance. This pin is monitored during V
DD
power-off for wake-up event detection.
KBRST
122
I/O
IN
T
/OD
2
V
DD
KBD Reset.
Keyboard reset (P20) open-drain output.
GA20
123
I/O
IN
T
/OD
2
V
DD
Gate A20.
KBC gate A20 (P21) open-drain output.
P12,
P16, P17
121,
70, 66
I/O
IN
T
/OD
2
,
O
2/2
V
DD
I/O Port.
KBC quasi-bidirectional signal for general-purpose input
and output (controlled by KBC firmware).
Signal
Pin(s)
I/O
Buffer Type Power Well
Description
GPIO01-04
125-128
I/O
IN
TS
/
OD
14
, O
3/14
V
SB
General-Purpose I/O Ports.
Each pin is configured
independently as input or I/O with or without static pull-up and
with either open-drain or push-pull output type. The GPIOE
nn
pins have event detection capability.
GPIOE44, 45 50, 51
I/O
IN
TS
/
OD
12
, O
12/12
V
SB
GPIO07
13
I/O
IN
TS
/
OD
4
, O
2/4
V
SB
GPIO53
45
I/O
IN
TS
/
OD
2
, O
1/2
V
SB
GPIO00,
GPIO05-06,
GPIOE10-17,
GPIO20-25,
GPIO26-27,
GPIO30-37,
GPIOE40-41,
GPIOE42, 43,
GPIOE46, 47,
GPIO50-52,
GPIO54, 55
124
9-10
1-8
14-19
22-23
24-31
2-21
35, 49
52, 53
36-38
54, 56
I/O
IN
TS
/
OD
6
, O
3/6
V
SB
GPO60-62,
63, 64
32-34,
48, 55
O
OD
6
, O
3/6
V
SB
General-Purpose Output Ports.
Each pin is configured
independently for either open-drain or push-pull output type.